To show a task, the submission must be in the same stage as the task. If you show a task that is assigned to a different award, it will only show that particular task to that particular applicant for that particular submission.

In some cases a task in your workflow may not be applicable to an applicant completing the application process. In this case you may wish to manually hide this submission from them so that it is not visible to them, or required to be completed in order to proceed.